JPS5943575Y2 - electronic photo printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic printer that performs recording by forming an electrostatic latent image on a photoreceptor, developing it, and transferring it to paper.

2. Description of the Related Art Generally, electrophotographic apparatuses in which an electrostatic latent image is formed on a photoreceptor, developed, and transferred onto paper are widely used.

Various types of electrophotographic devices have been proposed depending on the material of the photoreceptor, the electrostatic latent image formation process, the developing method, etc. Generally, the photoreceptor is drum-shaped and the paper is sheet-based. It is.

Using such conventionally proposed electrophotographic devices as an output device of an information processing system has the following problems.

First, high-speed printing is essential for this output device, and from the viewpoint of post-print processing and high-speed feeding reliability, it is necessary to use continuous paper with form printing, but with conventional electrophotographic devices, sheet paper is required. Because of the unit size, paper feed and photosensitive drum are not accurately synchronized, making it impossible to use such continuous paper.

Second, continuous paper must be fed intermittently depending on the presence or absence of recorded information, and consideration must be given to avoid contact with the photosensitive drum while the paper is stopped. Conventional electrophotographic devices do not take this into consideration at all. do not have.

An object of the present invention is to provide an electrophotographic printer that solves the above problems.

The purpose is to provide an endless photoconductor that rotates continuously, a drive source that rotationally drives the photoconductor, a latent image forming means that forms an electrostatic latent image on the photoconductor, and a drive source that rotates the photoconductor. means for visualizing with developer powder; a transfer roller for transferring the developer powder image onto continuous paper; and a second position in close contact with a first position separating the transfer roller from the photoreceptor. The electrophotographic printer is provided with a positioning means, a tractor for conveying the continuous paper to the temporary copying position, and a peeling bar for peeling the continuous paper from the photoreceptor, the peeling bar being for transporting the continuous paper to the temporary copying position. The tractor is provided in front of the transfer roller in the feeding direction, and the tractor receives the rotation of the drive source via a clutch, and when the conveyance of the continuous paper is stopped, the clutch is released to release the tractor. This is achieved by providing an electrophotographic printer characterized in that the transfer roller is positioned at a first position, and the continuous paper is peeled off from the photoreceptor by the peeling bar.

The present invention will be explained below based on examples.

FIG. 1 is a schematic diagram of an embodiment of the present invention.

Reference numeral 1 denotes a photosensitive drum, which may be a conductive drum with a photoconductive layer provided thereon, or an insulating layer further provided on the photoconductive layer.

Se in the photoconductive layer. Various types such as CDS can be used.

2 generates corona discharge with a charger.

Reference numeral 3 denotes an optical fiber tube as a light source exposure means, and other display means (for example, a plasma display, a laser, etc.) can also be used for optical image exposure.

4 is a developing device, and the developer may be either liquid or powder.

5 is a continuous form-printed paper. Plain paper can be used.

A transfer roller 6 functions to transfer the visible image formed on the photosensitive drum 1 onto the continuous paper 5.

Reference numerals 7 and 8 are tractors serving as paper feeding means, and rollers may be used, but if a tractor is used, the paper can be reliably aligned with a tractor pin.

9 is a peeling bar for separating the paper from the photosensitive drum 1, and 10 and 10' are paper feed guide rollers.

6 to explain this action! The drum 1 is charged by a charger 2 and imagewise exposed by an optical fiber tube 3 to form an electrostatic latent image.

This electrostatic latent image is developed by a developing device 4, and the developed image is transferred by a transfer roller 6 onto a continuous sheet of paper 5 that is fed by a tractor 7.8.

If no information is recorded from the optical fiber tube 3, paper feeding by the tractor 7.8 is stopped, and the transfer roller 6 and peeling bar 9 are operated as shown by dotted lines to peel the continuous paper 5 from the photosensitive drum 1.

When the optical fiber tube 3 starts recording information, the image formed by the optical fiber tube 3 reaches the transfer position, and the tractor 7.8 starts feeding the paper, returns the transfer roller 6 and peeling bar 9 to the position indicated by the solid line, and continues The paper 5 is brought into contact with the photosensitive drum 1-N.

FIG. 2 is a partial detailed view of an embodiment of the present invention, with numbers 1,
3, 5, 6, 7° 8.9, 10, 10' are the same as in FIG.

11 is a motor, 12 is a motor shaft, 12' is a tractor drive shaft, 13 is a drum drive shaft, 14 is a clutch, 15, 15
' is the transmission, 16.16'.

11 and 17' are pulleys, and 18 and 18' are timing belts (or chains).

To explain this figure, a motor 11 rotates a motor shaft 12 and also rotates a drum drive shaft 13 via a pulley 16, a timing bed 18, and a pulley 16'.

The tractor drive shaft 12 rotates a tractor drive shaft 12' via a clutch 14.

Also, since the width of one line of the continuous paper 5 varies depending on the purpose, such as 1/8 inch, 1/6 inch, 1/4 inch, and 1/3 inch, in order to keep the number of lines printed per unit time constant. It is necessary to make the feeding speed of the continuous paper 5 and the photosensitive drum 1 variable according to this width, and the transmissions 15 and 15' are provided to make the feeding speed of the continuous paper 5 and the photosensitive drum 1 variable.

The rotation transmitted to the tractor drive shaft 12' is transmitted to the tractor 8
At the same time, the tractor is operated via the pulley 17, timing bed 18, and pulley 17'.

Therefore, the tractor 8 and the photosensitive drum can rotate synchronously, and the image on the photosensitive drum can be transferred to continuous paper under optimal conditions.

Moreover, the clutch 14 can stop or feed the continuous paper.

It is preferable to use a half-rotation clutch as the clutch 14, taking into account the positioning of the paper stop position and the like.

A half-turn clutch can stop rotation every half turn,
Continuous rotation is also possible.

Furthermore, if a pole-conversion type motor is used as the motor, two-step speed change is possible by switching the rotation.

FIG. 3 shows another embodiment of the present invention, in which only the feeding system is shown in detail.

Number order 1, 7, 7', 8, 8'. 11.12,14,16
, 16', 17, 17'.

18 and 18' are the same as in FIG.

19 is a solenoid, 20 is a speed switching bar, 21°22.
23, 24 are gears, 25.25' is a slit disk, 26
, 26' are light emitting diodes, 27°21' are light receiving diodes, 30 is an interface control section, 31 is a mechanism control section, 32 is a recording control section, 33 is a clutch control section, and 34 is a transfer control section.

To explain this operation, the gear 23 is connected to the shaft 12 of the motor 11.
It is directly connected to and constantly rotates.

Gears 21 and 22 are also constantly meshing with gear 23 and rotating.

To change the speed, operate the solenoid 19, operate the speed switching bar, and select the gear 21. Alternatively, this can be done by meshing either gear 22 with gear 24.

Therefore, if the ratio of the gear teeth is selected appropriately, the above-mentioned continuous paper
You can get a speed that corresponds to the width of the line.

Further, regarding the recording information sent from the information processing device, the interface control section 30 sends operation commands to the mechanism control section 31 and recording character data etc. to the recording control section 32-\.

Mechanism control unit 31 is tractor I. The clutch controller 33 that controls the clutch 14 is operated in synchronization with timing pulses obtained from the slit disk 25, the light emitting diode 26', and the light receiving diode 27', which rotate synchronously with the light emitting diode 26' and the light receiving diode 27'.

Transfer control unit 34 that controls the transfer roller 6 and peeling bar 9
make it work.

The recording control unit 32 receives recorded character data, etc., and controls the recording unit (
Operate the optical fiber tube 3).

As described above, according to the present invention, since the continuous paper and the photosensitive drum can be rotated synchronously, it is possible to reliably transfer the image on the photosensitive drum to the continuous paper. Since continuous paper can be fed intermittently depending on the amount of paper and does not come into contact with the photosensitive drum while the continuous paper is stopped, staining of the paper and abrasion of the photosensitive drum can be prevented.

This allows the photosensitive drum to rotate continuously, so information can be recorded immediately as it comes.

The electrostatic latent image forming process of the present invention is not limited to the described embodiments, but other reverse electric field methods and the like can be used.

Furthermore, in addition to using the above-mentioned photosensitive drum as the photosensitive member, a sheet-like photosensitive member formed into an endless shape may also be used.

In addition, since the peeling bar is arranged before the transfer unit, it is possible to peel the continuous paper from the photosensitive drum or photosensitive sheet using the area of the continuous paper that has not been transferred yet, and it is possible to peel off the continuous paper from the photosensitive drum or photosensitive sheet by using the area of the continuous paper that has not yet been transferred. The transferred image does not come into direct contact with the peeling bar.

Therefore, the unfixed toner image is not disturbed by the peeling bar, and the print quality is not degraded.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention, FIG. 2 is a partial detailed diagram of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of another embodiment of the present invention. 1 is a photosensitive drum, 2 is a charger, 3 is an optical fiber tube, 4 is a developing device, 5 is a form-printed continuous paper, 6 is a transfer roller, 7 and 8 are tractors, 9 is a peeling bar,
10.10 is a paper feed guide roller, 11 is a motor, 12 is a motor shaft, 12' is a tractor drive shaft, 13 is a drum drive shaft, 14 is a clutch, 15.15' is a transmission,
i6,16'. 17.17' is a pulley, 18, 1B' is a timing belt (or chain), 19 is a solenoid, 20 is a speed switching bar, 21.22, 23.24 are gears, 25.25
' is a slit disk, 26 and 26' are light emitting diodes,
27, 27' are light receiving diodes, 30 is an interface control section, 31 is a mechanism control section, 32 is a recording control section, 33
3 is a clutch control section, and 34 is a transfer control section.

Claims (1)

[Scope of utility model registration request] an endless photoreceptor that rotates continuously; a drive source that rotationally drives the photoreceptor; a latent image forming means that forms an electrostatic latent image on the photoreceptor; means for forming an image, a transfer roller for transferring the developer powder image onto a continuous sheet of paper, and positioning means for positioning the transfer roller at a first position separating the transfer roller from the photoreceptor and a second position in close contact with the photoreceptor. , an electrophotographic printer comprising: a tractor that transports the continuous sheet of paper to the transfer position; and a peeling bar that peels the continuous sheet of paper from the photoreceptor, the peeling bar having a The tractor is provided in front of the transfer roller, and the tractor receives and controls the rotation of the drive source via a clutch, and when the conveyance of the continuous paper is stopped, the clutch is released to release the tractor, and the positioning the transfer roller in the first position;
An electrophotographic printer further characterized in that the continuous paper is peeled off from the photoreceptor by the peeling bar.